2005 Re-analysis of the d+Au data

11-JUNE-2007

Preparing for the collaboration meeting I just plow ahead and generate spectra, the first thing I dis was to reproduce the min-bias positive pions, the summary plo its here:

Minimum biased positive pions

Centrality 0-20% positive pions

Centrality 20-40% positive pions

Centrality 40-80% positive pions

3-MAY-2007

The recovery of runs that were not included in the RdAu paper analysis is encountering some problems.

Ratio of piMinus/piPlus spectra Prod3

The abundance of charged pions is driven by the beam (d) isospin (0), the ratio of the two spectra should be constant and equal to 1. The assumption here is that the positive pion spectrum is right because it does not contain runs from groups A or B, and the structures seen in this plot are only related to bad spectra production from data out of groups A (4A843 and 4A430) and B (4A1692 and 4A2268). In order to shore up the quality of the piPlus spectrum I decided to compare it to the one we obtained in production 2. The comparison shows an overall 18% that needs to be explained:

Before I get into those details I have to explain a discrepancy between the results (positive pions) obtained with dst from production 2 and 3.

The following figure shows the ratio of the positive pion spectra at 2.9

Ratio of piPlus spectra Prod3/Prod2

The production 2 spectra were generated in FEB 2006 with a script saved in ~debbe/analysis/newdAanalysis/spectraObject/dAu2003/newCutsAndCorr/run03BEffvarBin.Csave. This script is using the first version of Flemming's decay and absorption corrections (before they were placed in the official brahms/data08/correction directory. They also use my old rich efficiency correction that may not affect the spectra because I only fill it with pions with p>3.5 GeV/c. Tracking efficiency is done with the map I calculated for the RdAu paper (production1) the number of tracks found in production2 has increased and the correct thing is to use a new map extracted from from the same production, as is the case with the production 3 work.

In conclusion; the comparison between spectra produced with production 2 and 3 is bound to fail because the generation of production 2 spectra did not include the proper corrections.

19-APR-2007

This is a repository of diagnostic plots produced during spectra generation. I start with group A of dA runs.

Group A

4A843

Elliptic YZ after cut 4A843A

Momentum vs run number 4A843A

Track proj. Z vs run number 4A843A

Data overlaid on acceptance 4A843A

4A430

Elliptic YZ after cut 4A430A

Data overlaid on acceptance 4A430A

Group B

These runs have cross-talk in Camac discriminators used to define trigger 5 with INEL detectors. The normalization of these runs is done with trigger 4 (ZDC) properly scaled to reproduce the trigger 5 normalization as found in runs where INEL works well. The vertex definition for the normalization is done with G_fZdcVtxZ. The spectra are built with FS tracks, the vertex definition id done with FS_fVtxProjZ shifted by the mean of that distribution ( a few cm.) The elliptic cut that used to be done on Y, Z difference between INEL and track projection is changed to apply to the Y coordinate of the track projection only.

27-Feb-2007

We are now reading dsts from Production 3. My work is done in the rcas machines in the directory: ~debbe/analysis/newdAanalysis/spectraObject/dAu2003/production3/

For what concerns this analysis Production 3 is different from the previous one mainly in the fact that it includes all d Au runs

The ZDC soft sum versus centrality shown in the two figure above shows tha requiring a single neutron in the ZDC right (deuteron fragmentation region) will select events that are mainly peripheral, but we may still be able to apply some centrality conditions.

For the 4A3450 settings (run number > 8307), 1/3 of the events populate the pedestal peak in the ZDC sftware sum on the deuteron side.

The spectrum shown in the figure above correspond to positive pions detected in the full FS spectrometer at 4 degrees in events that had signal in the ZDC right (d fragmentation region) corresponding to a single neutron at zero degrees.

The figure above shows that a good fraction of events with several neutrons in the ZDC (Au side) also have a single neutron in the d side ZDC.

2-Feb-2006

Updated spectra that include new decay and absorption corrections, new vertex cuts, as well as cuts on Chi square of the global track fit.

In similar fashion as done for the pp spectra the comparison between old and new spectra is presented below as ratios:

Negative pions at y = 3.0

Positive pions at y = 3.0

Positive kaons at y = 3.0

Negative kaons at y = 3.0

Anti-protons at y = 3.0

Protons at y = 3.0

15-Nov-2005

More monitoring plots obtained during spectra generation:

The following plots were obtained with the method that compares calculated ring radius and the measured one. The distribution has gaussian shape and the particle is identified if the radii diference is within three standard deviations.

RICH pid full field 4 degrees A polarity

RICH pid quarter field 4 degrees A polarity

The difference of calculated radii minus measured ones is shown in the following plots:

Radius difference for PION assumption at full field 4 degrees A polarity

Radius difference for PION assumption at full field 4 degrees B polarity

Radius difference for KAON assumption at full field 4 degrees A polarity

Radius difference for KAON assumption at full field 4 degrees B polarity

Radius difference for PROTON assumption at field 4 degrees A polarity

Radius difference for PROTON assumption at field 4 degrees B polarity

13-Sep-2005

This is a page under construction I only use it to point to monitoring plots.

TrckVtxZ - InelVtxZ vs run number dAu 4B3450